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All of the coliforms and Proteus species are Gram negative, facultative anaerobic, non-spore- forming rods that are typically motile, except for Klebsiella, which is nonmotile. The oxidase test is negative, and nitrates are reduced to nitrites.
The identification of lactose-fermenting Gram-negative rods belonging to the bacterial family Enterobacteriaceae (bacteria commonly referred to as coliforms) in water is often used to determine if water has been fecally contaminated and, therefore, may contain disease-causing pathogens transmitted by the fecal-oral route.
8 Αυγ 2023 · Objectives: Outline the types of gram-negative organisms that are clinically significant. Identify the treatment options for gram-negative infections based on the location and type of infection. Describe the mechanisms by which gram-negative bacteria can become resistant to antibiotics.
10. Add to Group. In this learning activity you'll observe the growth of gram negative organisms and determine if they're lactose positive or negative.
Interpretation of preliminary microbiology data. Small, pleomorphic: Actinomyces spp. P. acnes, *Serratia and Citrobacter spp can appear initially as non-lactose fermenting due to slow fermentation. Interpretations of Key Phrases. “Gram positive cocci in clusters” may suggest Staphyloccocus species.
MacConkey agar is a selective medium used for the isolation of non-fastidious Gram-negative rods, particularly members of the family Enterobacteriaceae and the genus Pseudomonas, and the differentiation of lactose fermenting from lactose non-fermenting Gram-negative bacilli.
11 Οκτ 2014 · Enterobacteriaceae is a family of Gram-negative, facultatively anaerobic, non-spore-forming rods. Characteristics of this family include being motile, catalase positive, and oxidase negative; reduction of nitrate to nitrite; and acid production from glucose fermentation. However, there are also many exceptions.
